aboutsummaryrefslogtreecommitdiffstats
path: root/security
diff options
context:
space:
mode:
authorCasey Schaufler <casey@schaufler-ca.com>2014-12-12 17:19:19 -0800
committerCasey Schaufler <casey@schaufler-ca.com>2015-01-20 16:32:17 -0800
commit5e7270a6dd14fa6e3bb10128f200305b4a75f350 (patch)
tree586640992a1e76584e85a73f6651c018dffc8843 /security
parent96be7b5424948ae39d29d5149eaec0bd6edd7404 (diff)
Smack: Rework file hooks
This is one of those cases where you look at code you did years ago and wonder what you might have been thinking. There are a number of LSM hooks that work off of file pointers, and most of them really want the security data from the inode. Some, however, really want the security context that the process had when the file was opened. The difference went undetected in Smack until it started getting used in a real system with real testing. At that point it was clear that something was amiss. This patch corrects the misuse of the f_security value in several of the hooks. The behavior will not usually be any different, as the process had to be able to open the file in the first place, and the old check almost always succeeded, as will the new, but for different reasons. Thanks to the Samsung Tizen development team that identified this. Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
Diffstat (limited to 'security')
-rw-r--r--security/smack/smack_lsm.c40
1 files changed, 19 insertions, 21 deletions
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 654345de62e7..1fa72317bbec 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -160,7 +160,7 @@ static int smk_bu_file(struct file *file, int mode, int rc)
{
struct task_smack *tsp = current_security();
struct smack_known *sskp = tsp->smk_task;
- struct inode *inode = file->f_inode;
+ struct inode *inode = file_inode(file);
char acc[SMK_NUM_ACCESS_TYPE + 1];
if (rc <= 0)
@@ -168,7 +168,7 @@ static int smk_bu_file(struct file *file, int mode, int rc)
smk_bu_mode(mode, acc);
pr_info("Smack Bringup: (%s %s %s) file=(%s %ld %pD) %s\n",
- sskp->smk_known, (char *)file->f_security, acc,
+ sskp->smk_known, smk_of_inode(inode)->smk_known, acc,
inode->i_sb->s_id, inode->i_ino, file,
current->comm);
return 0;
@@ -1347,6 +1347,9 @@ static int smack_file_permission(struct file *file, int mask)
* The security blob for a file is a pointer to the master
* label list, so no allocation is done.
*
+ * f_security is the owner security information. It
+ * isn't used on file access checks, it's for send_sigio.
+ *
* Returns 0
*/
static int smack_file_alloc_security(struct file *file)
@@ -1384,17 +1387,18 @@ static int smack_file_ioctl(struct file *file, unsigned int cmd,
{
int rc = 0;
struct smk_audit_info ad;
+ struct inode *inode = file_inode(file);
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
smk_ad_setfield_u_fs_path(&ad, file->f_path);
if (_IOC_DIR(cmd) & _IOC_WRITE) {
- rc = smk_curacc(file->f_security, MAY_WRITE, &ad);
+ rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad);
rc = smk_bu_file(file, MAY_WRITE, rc);
}
if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ)) {
- rc = smk_curacc(file->f_security, MAY_READ, &ad);
+ rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad);
rc = smk_bu_file(file, MAY_READ, rc);
}
@@ -1412,10 +1416,11 @@ static int smack_file_lock(struct file *file, unsigned int cmd)
{
struct smk_audit_info ad;
int rc;
+ struct inode *inode = file_inode(file);
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
smk_ad_setfield_u_fs_path(&ad, file->f_path);
- rc = smk_curacc(file->f_security, MAY_LOCK, &ad);
+ rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad);
rc = smk_bu_file(file, MAY_LOCK, rc);
return rc;
}
@@ -1437,7 +1442,7 @@ static int smack_file_fcntl(struct file *file, unsigned int cmd,
{
struct smk_audit_info ad;
int rc = 0;
-
+ struct inode *inode = file_inode(file);
switch (cmd) {
case F_GETLK:
@@ -1446,14 +1451,14 @@ static int smack_file_fcntl(struct file *file, unsigned int cmd,
case F_SETLKW:
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
smk_ad_setfield_u_fs_path(&ad, file->f_path);
- rc = smk_curacc(file->f_security, MAY_LOCK, &ad);
+ rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad);
rc = smk_bu_file(file, MAY_LOCK, rc);
break;
case F_SETOWN:
case F_SETSIG:
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
smk_ad_setfield_u_fs_path(&ad, file->f_path);
- rc = smk_curacc(file->f_security, MAY_WRITE, &ad);
+ rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad);
rc = smk_bu_file(file, MAY_WRITE, rc);
break;
default:
@@ -1571,14 +1576,10 @@ static int smack_mmap_file(struct file *file,
* smack_file_set_fowner - set the file security blob value
* @file: object in question
*
- * Returns 0
- * Further research may be required on this one.
*/
static void smack_file_set_fowner(struct file *file)
{
- struct smack_known *skp = smk_of_current();
-
- file->f_security = skp;
+ file->f_security = smk_of_current();
}
/**
@@ -1630,6 +1631,7 @@ static int smack_file_receive(struct file *file)
int rc;
int may = 0;
struct smk_audit_info ad;
+ struct inode *inode = file_inode(file);
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
smk_ad_setfield_u_fs_path(&ad, file->f_path);
@@ -1641,7 +1643,7 @@ static int smack_file_receive(struct file *file)
if (file->f_mode & FMODE_WRITE)
may |= MAY_WRITE;
- rc = smk_curacc(file->f_security, may, &ad);
+ rc = smk_curacc(smk_of_inode(inode), may, &ad);
rc = smk_bu_file(file, may, rc);
return rc;
}
@@ -1661,21 +1663,17 @@ static int smack_file_receive(struct file *file)
static int smack_file_open(struct file *file, const struct cred *cred)
{
struct task_smack *tsp = cred->security;
- struct inode_smack *isp = file_inode(file)->i_security;
+ struct inode *inode = file_inode(file);
struct smk_audit_info ad;
int rc;
- if (smack_privileged(CAP_MAC_OVERRIDE)) {
- file->f_security = isp->smk_inode;
+ if (smack_privileged(CAP_MAC_OVERRIDE))
return 0;
- }
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
smk_ad_setfield_u_fs_path(&ad, file->f_path);
- rc = smk_access(tsp->smk_task, isp->smk_inode, MAY_READ, &ad);
+ rc = smk_access(tsp->smk_task, smk_of_inode(inode), MAY_READ, &ad);
rc = smk_bu_credfile(cred, file, MAY_READ, rc);
- if (rc == 0)
- file->f_security = isp->smk_inode;
return rc;
}

Privacy Policy